Carpenter's principles of human physiology . d be extinguished, for such a section would obviously divide allthe sensory nerves, and, according to M. Brown-Sequard, this is actually theresult obtained. Other observers,! however, though admitting there is greatdiminution of sensibility after a longitudinal division of the cord, maintain thatdistinct evidence of the conduction of sensory impressions may still be the discrepancies in the results of the operation in the hands of dif-ferent experimenters are due to different animals having been used; forM. Brown-Sequard has himself
Carpenter's principles of human physiology . d be extinguished, for such a section would obviously divide allthe sensory nerves, and, according to M. Brown-Sequard, this is actually theresult obtained. Other observers,! however, though admitting there is greatdiminution of sensibility after a longitudinal division of the cord, maintain thatdistinct evidence of the conduction of sensory impressions may still be the discrepancies in the results of the operation in the hands of dif-ferent experimenters are due to different animals having been used; forM. Brown-Sequard has himself observed, that the decussation of the sensoryfibres is neither so complete or immediate in Keptiles and Birds as in Mam-mals, and he has further noticed, that it does not seem to be so perfect in thelumbar as in the dorsal region.| He is of opinion that whilst the sensory * From afoOrjcTi;, sensation, and 656s, a path. Op. cit., p. 247. T Ore, Comptes Kendus, t. xxxviii., 1854. Also Longet, Schiff, and Vulpian. | Op. cit., p. 37. Fig. FUNCTIONS OF THE SPINAL CORD. 601 fibres of the posterior roots in part run at once to the opposite side of the greysubstance, some of them ascend and others descend for a short distance in thegrey substance before decussating. Thus, if in one animal the posteriorcolumns be divided above the origin of a particular pair of nerves, and theposterior columns be then dissected back for a short distance (Fig. 237), Fig. 237. Fig. 238.
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